That's really quite good. A tad too much magenta.
Noel Carboni Photoshop actions has a select out brighter stars that works really. Otherwise use colour range tool, click on a bright star, slide the fuzziness slider over until it is selecting quite a few stars then enter.
There is also a plus sign on one of the selector buttons on the colour range tool if you want to continue to select stars so you get a decent sample going.
The Carboni action though works great and is automatic.
You can then expand the selection to widen the circle so it includes the star and its outer rings.
Greg.
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